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Plato held that moral values are objective in the sense that they exist in a spirit-like realm beyond subjective human conventions
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Aristotle argued that virtues are good habits that we acquire, which regulate our emotions.
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St. Augustine's ethic is primarily an ethic of live: it is by the will that man reaches out toward God and finally takes possession of and enjoys Him.
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His moral philosophy involves a merger of at least two apparently disparate traditions: Aristotelian eudaimonism and Christian theology.
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Kantian ethics emphasizes a single principle of duty. He agreed that we have moral duties to oneself and other.